Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1982-12-10
1985-05-14
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277221, F16J 1518
Patent
active
045167850
ABSTRACT:
In a pump for pumping fluid having a piston with a flange, a cylinder, a gap between the cylinder and the flange, and a sealing device, an improved sealing device has an anti-extrusion ring located at a face of the sealing device opposite the fluid. The anti-extrusion ring is bonded to the sealing device and is biased to be in intimate, movable contact with the cylinder. The anti-extrusion ring is made from a material having a modulus of elasticity sufficient so that it does not extrude into the gap under the influence of the hydrostatic pressure generated during pump operation. The sealing device, or a portion thereof, has a modulus of elasticity sufficient to control the radially outward expansion of the anti-extrusion ring so that the sides of the ring do not press too tightly against and cause excessive wear of the cylinder. The anti-extrusion ring has at least one split in it, and a ring having a number of tangential-cut splits or step-cut splits could be used.
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Edwin C. Lewis II, "Mud Pump Failure Analysis Part 4--Extrusion, The Primary Cause of Piston Failure", Petroleum Engineer International, Oct., 1981.
Fortino Dennis J.
Miller John E.
Chromium Corporation
Smith Robert I.
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